creative commons photos

Hello.

On flickr, you can search for photos with a CC license that you can
modify or even use commercially.
Does anyone know of any other photowebsites that offer a similar
collection or archive of photos that can be used freely (except for
mentioning the source)?

Kind regards & thanks in advance for any suggestions, Niek

Hello.

On flickr, you can search for photos with a CC license that you can
modify or even use commercially.
Does anyone know of any other photowebsites that offer a similar
collection or archive of photos that can be used freely (except for
mentioning the source)?

Kind regards & thanks in advance for any suggestions, Niek

ps. repeated posting, because of potential filtering of groups.google
postings